Jupiter should indicate the periods of least solar disturbance; 

 the solstice which is nearly coincident with the perihelion 

 passage being taken as corresponding to the present recognized 

 period of minimum sun-spots. We have accordingly prepared 

 the following table to institute a comparison between Jupiter's 

 solstice corresponding to the earth's winter solstice (near 

 perihelion) and the sun-spot minima. Wolf's data are taken 

 for sun-spo1 minima, and Tiee's for Jupiter's perihelion dates 

 which the solstice approximates : 



Jupiter's Solstice Sun-Spot 



near Perihelion. Minima. Difference. 



1832.11 1833.9 +1.79 



1843.97 1843.5 + .47 



1855.83 1856 -j- .17 



1S67.69 1867.2 — .49 



1879.55 1879 — .55 



1891.41 1889.6 —1.81 



1903.27 1901.5 —1.77 



Greatest -4- variation 1.79 



Greatest — variation 1.81 



Average -4- 81 



Average - — 1.15 



Average of all l.-|- 



Here, as before, when the sun-spot minimum precedes the 

 solstitial date, the difference is prefixed by a minus sign; when 

 the sun-spot minimum follows the solstitial date, the difference 

 is prefixed by a pins sign. 



In the above table the approximations are not so close as 

 in the preceding, but still close enough to be quite remarkable. 

 This, at any rate, constitutes a double comparison, which tends 

 to sustain our position from both points of observation. 



Prof. Tice allows three years for the duration of an equi- 

 noctial disturbance of Jupiter — three-fifths of that time be- 

 fore and two-fifths after the equinoctial passage — so that the 

 variations found in the first table come well within the limit 

 allowed. 



To make this showing of approximations more evident, 

 we present the following graphic diagram: 



54 



